I am using Airtel 4g from last 4 months and had ridiculous experience. First you will rarely get the 4g or LTE network anywhere. Ultimately paying for 4g we get 3g only. When you desperately need Internet for something you have to run here and there for networks.
If in internet settings you are keeping 4g recommended then for you it will get difficult to have network for calling also.
This is not happening only with me, in my family all members are using Airtel 4g and suffering from the same issues.
It gives feeling of begging for the networks. I think Airtel people are wasting their whole money for advertisement instead for services.
In advertise they are showing 4g network catches everywhere it’s a damn fake. And I am one of the frustrated customer of 4g Airtel.
Definitely going to port.